I just read the contribution guidlines and was impressed by how well documented the rules are. :)

Also, I remember that long time ago (up to 6.1), there was a module named base_module_quality that could audit the source code and find all the non-compliance point based on coding guidlines.

Is there some equivalent tool today?

If there is none, I guess it would make sense to have it as a command in maintainer-tools: oca-code-review which could audit the code without the need of installing the related module. Maybe we can help with that.